feat: native tokens #212

Job	Run time
check no-default-features	31s
check std	44s
check serde	36s
clippy	2m 36s
docs	2m 8s
fmt	6s
test stable --no-default-features	1m 21s
Test Native Tokens	37s
test no_std	37s
test stable	1m 40s
test stable --all-features	2m 43s
test beta --no-default-features	1m 43s
test beta	1m 42s
test beta --all-features	2m 25s
test nightly --no-default-features	1m 10s
test nightly	1m 18s
test nightly --all-features	2m 12s
	24m 9s

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